NEET Chemistry: Structure of Atom — Practice Set 9

Q1. A photon has a wavelength of \( 200 \, \text{nm} \). What is its frequency? (\( c = 3.0 \times 10^8 \, \text{m s}^{-1} \))

A. \( 7.5 \times 10^{14} \, \text{Hz} \)
B. \( 1.5 \times 10^{15} \, \text{Hz} \)
C. \( 3.0 \times 10^{15} \, \text{Hz} \)
D. \( 6.0 \times 10^{14} \, \text{Hz} \)

Q2. The wavelength of the first line in the Paschen series of a hydrogen atom is: (\( R_H = 1.097 \times 10^7 \, \text{m}^{-1} \))

A. \( 656.3 \, \text{nm} \)
B. \( 121.6 \, \text{nm} \)
C. \( 1876 \, \text{nm} \)
D. \( 410.2 \, \text{nm} \)

Q3. Which quantum number determines the orientation of an orbital in space?

A. Principal quantum number (\( n \))
B. Azimuthal quantum number (\( l \))
C. Magnetic quantum number (\( m_l \))
D. Spin quantum number (\( m_s \))

Q4. The wavelength of the fourth line in the Brackett series of a hydrogen atom is: (\( R_H = 1.097 \times 10^7 \, \text{m}^{-1} \))

A. \( 2625 \, \text{nm} \)
B. \( 1458 \, \text{nm} \)
C. \( 4858 \, \text{nm} \)
D. \( 2166 \, \text{nm} \)

Q5. How many subshells are present in the \( n = 4 \) energy level?

A. A. 2
B. B. 3
C. C. 4
D. D. 5

Q6. The ionization energy of a hydrogen atom is \( 13.6 \, \text{eV} \). What is the energy required to remove an electron from \( n = 3 \) to infinity in \( \text{Be}^{3+} \)?

A. \( 13.6 \, \text{eV} \)
B. \( 24.18 \, \text{eV} \)
C. \( 217.6 \, \text{eV} \)
D. \( 6.04 \, \text{eV} \)

Q7. A neutron has a kinetic energy of \( 1.67 \times 10^{-18} \, \text{J} \). What is its de Broglie wavelength? (\( h = 6.626 \times 10^{-34} \, \text{J s} \), \( m_n = 1.67 \times 10^{-27} \, \text{kg} \))

A. \( 1.402 \times 10^{-12} \, \text{m} \)
B. \( 3.965 \times 10^{-12} \, \text{m} \)
C. \( 5.27 \times 10^{-12} \, \text{m} \)
D. \( 2.805 \times 10^{-12} \, \text{m} \)

Q8. A photon of frequency \( 7.5 \times 10^{14} \, \text{Hz} \) ejects an electron from a metal with a kinetic energy of \( 1.9878 \times 10^{-19} \, \text{J} \). What is the work function? (\( h = 6.626 \times 10^{-34} \, \text{J s} \))

A. \( 2.9817 \times 10^{-19} \, \text{J} \)
B. \( 4.9695 \times 10^{-19} \, \text{J} \)
C. \( 1.9878 \times 10^{-19} \, \text{J} \)
D. \( 3.9756 \times 10^{-19} \, \text{J} \)

Q9. The charge-to-mass ratio of an electron is determined to be \(1.758820 \times 10^{11} \, \text{C kg}^{-1}\). If the charge on an electron is \(-1.602176 \times 10^{-19} \, \text{C}\), what is the mass of an electron in kilograms?

A. \(9.1094 \times 10^{-31} \, \text{kg}\)
B. \(1.602176 \times 10^{-19} \, \text{kg}\)
C. \(1.758820 \times 10^{11} \, \text{kg}\)
D. \(9.1094 \times 10^{-19} \, \text{kg}\)

Q10. An electron and a neutron have the same kinetic energy. What is the ratio of their de Broglie wavelengths? (\( m_e = 9.1 \times 10^{-31} \, \text{kg} \), \( m_n = 1.67 \times 10^{-27} \, \text{kg} \))

A. 1
B. 42.8
C. 1835
D. 0.023

Chemistry — Structure of Atom

Set 9 of 20

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A photon has a wavelength of \( 200 \, \text{nm} \). What is its frequency? (\( c = 3.0 \times 10^8 \, \text{m s}^{-1} \))

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